Every time i paint my bathroom ceiling after a few weeks the paint starts to bubble?

i have tried adding mildew additives %26amp; primers nothing seems to work I also have a ceiling exhaust but does not seem to help water is getting under the paint!Every time i paint my bathroom ceiling after a few weeks the paint starts to bubble?
The sheetrock must be damp, you might have to relace it.Every time i paint my bathroom ceiling after a few weeks the paint starts to bubble?
What you can do is one check the ceiling for moisture then paint it with Kilz and then a bathroom ceiling paint. put a couple layers of kilz then paint. If the ceiling is not damp.
Check with your local paint store to be sure, but I'm wondering if you're painting latex over an oil-based paint. You mention using primers and I would think that would take care of it, but oil-based paints and primers do respond differently when mixed with latex or water-based products.





If there are pipes located overhead, then this could be a separate issue altogether. Are you seeing actual water stains and spots on your ceiling, or is it only the paint bubbling? If you see where water is actually coming through, then you will need a plumber certainly.





I know it's frustrating when you try to address a problem like this that keeps recurring, so call in the professionals - whether the pros at the paint store (and I do mean PROS - like at Sherwin Williams, Glidden, or Benjamin Moore paint stores - not some part-time counter clerk from hardware at Lowe's or Home Depot), or a plumber. You'll save yourself alot of aggravation in the long run!





Best wishes -
If you don't have a vent fan you need to get one after you fix the problem i.e. replace the ceiling if the sheet rock is moist. If it is continuing in the same spot try to figure were your water lines are running possible leak.
All of the earlier answers are excellent but there is one other thing to try. Is it possible that the previous owner of the house used wallpaper of the ceiling. If so, the paint will sometimes loosen the paste and cause the finish to bubble. This usually happens within a few hours of applying the paint. If this is the case you will have to remove the old paper and then paint again.
I don't know where you are, but regardless of the season you can have too much water in the crawl space around the outside of your house. Have a maintenance person check your crawl space. They can add a device that helps eliminate some of the water. It's getting behind the walls of your house and causing excess water that you can't see.